Consider mapping JSON schema `ipv4` and `ipv6` formats to `iptypes` custom types

### Use Cases or Problem Statement

JSON schema (the backbone of all the request/response body schemas in OpenAPI 3.0/3.1) supports designating a `type: string` as an IPv4 or IPv6 address string via the `format` field: https://json-schema.org/understanding-json-schema/reference/string#ip-addresses.

Recently, HashiCorp has published [terraform-plugin-framework-nettypes](https://pkg.go.dev/github.com/hashicorp/terraform-plugin-framework-nettypes@v0.1.0/iptypes), which contains an `iptypes` package with `IPv4Address` and `IPv6Address` [custom string types](https://developer.hashicorp.com/terraform/plugin/framework/handling-data/types/custom), which provide validation and semantic equality handling (for IPv6) that are often required for IP address strings. The Provider code specification already supports [custom types](https://developer.hashicorp.com/terraform/plugin/code-generation/specification#custom_type).

### Proposal

### Proposal

- For any string types that define a `format` of `ipv4`, add the `iptypes.IPv4AddressType` type and `iptypes.IPv4Address` value to the custom type in the outputted provider code spec.

#### Schema
```yaml
ipv4_prop:
description: IPv4 address string!
type: string
format: ipv4
```

#### IR Attribute
```json
{
"name": "ipv4_prop",
"string": {
"computed_optional_required": "computed",
"description": "IPv4 address string!",
"custom_type": {
"import": {
"path": "github.com/hashicorp/terraform-plugin-framework-nettypes/iptypes"
},
"type": "iptypes.IPv4AddressType",
"value_type": "iptypes.IPv4Address"
}
}
}
```

- For any string types that define a `format` of `ipv6`, add the `iptypes.IPv6AddressType` type and `iptypes.IPv6Address` value to the custom type in the outputted provider code spec.

#### Schema
```yaml
ipv6_prop:
description: IPv6 address string!
type: string
format: ipv6
```

#### IR Attribute
```json
{
"name": "ipv6_prop",
"string": {
"computed_optional_required": "computed",
"description": "IPv6 address string!",
"custom_type": {
"import": {
"path": "github.com/hashicorp/terraform-plugin-framework-nettypes/iptypes"
},
"type": "iptypes.IPv6AddressType",
"value_type": "iptypes.IPv6Address"
}
}
}
```

### Additional Information

_No response_

### Code of Conduct

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